API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier 16-Ounce Bottle
$12.99
Price: $12.99
(as of Oct 16, 2025 16:47:08 UTC – Details)
Fish continually release ammonia into the aquarium through their gills, urine and solid waste. Uneaten food and decaying organic matter also add ammonia to the water. Even small amounts of ammonia stress fish; large amounts of ammonia will kill fish. Ammonia is the #1 killer of freshwater fish. API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier works instantly to detoxify ammonia, chlorine, and chloramines in fresh and saltwater aquariums. API AMMO-LOCK Ammonia Detoxifier Freshwater and Saltwater Aquarium Treatment does not remove ammonia from water; it converts it to a non-toxic form. Aquarium water will show a reduction in ammonia on API Test Kits, but a 25% water change is still recommended after dosing. For best results, use as directed on the product label. If your aquarium tests positive for ammonia, do a partial water change, then neutralize the ammonia with API AMMO-LOCK Ammonia Detoxifier Aquarium Treatment. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.
Is Discontinued By Manufacturer : No
Product Dimensions : 6 x 6 x 8 inches; 1 Pounds
Manufacturer recommended age : 1 month and up
Item model number : 45E
Department : Unisex-Adult
Date First Available : June 20, 2004
Manufacturer : Mars Fishcare
ASIN : B000255N0A
Best Sellers Rank: #15,428 in Pet Supplies (See Top 100 in Pet Supplies) #126 in Aquarium Water Treatments
Customer Reviews: 4.6 4.6 out of 5 stars 5,113 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Contains one (1) API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier 16-Ounce Bottle
Detoxifies ammonia in aquarium water and tap water
Works instantly to make aquarium water safe for fish
Reduction in ammonia levels measurable on any API Test Kits
Dose freshwater and saltwater every two days until ammonia is not detected
Customers say
Customers find the ammonia detoxifier effective, particularly noting it works well in 55-gallon tanks and helps maintain balanced levels. The product receives positive feedback for its quality, ease of use, and value for money, while keeping fish safe and healthy. However, experiences with ammonia levels and fish survival are mixed – while some report successful ammonia control and fish survival, others mention ammonia readings jumping to over 1ppm and fish deaths. The water clarity aspect also receives mixed reviews, with some reporting cloudy water.
13 reviews for API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier 16-Ounce Bottle
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$12.99
Twinkle –
Works quickly
I have a 2 gallon tank with a Betta and snail. Some plants and a strong enough filter. I donât think I over feed and clean up leftovers before turning the filter back on. I removed any dead or rotting plant pieces and did a partial water change. I used non chlorinated tap water. The next day the ammonia levels on detector were worse. I swapped out a little bit more water and expected a change. Nothing! I ordered this product it came next day. I was so concerned because directions are for a ratio of a ten gallon tank. My brain does not work well first thing in the morning and I was not going to start mixing up 10 gallons of water either. If youâre in the same boat, fear not. Iâve got you covered. I have included in pictures that the cap has measurements for 1,5 and 10 milliliters.1ml. of solution per 2 gallons of water, 5ml. Solution per 10 gallons of water and10ml. Solution per 20 gallons of water. Basically whatever gallons your tank is, divide in half and that number is the amount of ml. needed. Ammonia levels were reduced in minutes.
BUYER777787 –
Great!!!!
Always use this great stuff!!!!
Nicholas –
A life saver
Hospital tanks are sometimes a death trap because water cycle goes out of whack real fast. But this actually quickly gets rid of / prevents ammonia quick so the fish is not bothered while already sick and weakened
Kyle –
Not as fast as it could be
This product eventually did work, but it took A LOT more time and Ammo Lock than I would’ve thought. About 2 months total. I guess in the end, it works and the price isn’t too bad either.
Alexandra Nofi –
Dramatically reduced ammonia
I was having awful ammonia problems in my tank, despite it A) not being overstocked B) not overfeeding C) no dying plants. I was doing daily water changes (45%) and the ammonia was still building up. Even after replacing the filter (the filter did need replacing) the ammonia was still building up though not as fast as before. For a tank that I’ve had set up for two months now, it was really frustrating how it wouldn’t cycle properly.What I did was change the water, then put in the ammo lock along with two other API products, stress coat+ and quick start. I think it helps to use ammo lock with other API products, since they do make their products “work together”. Anyway, I did this once a day, every day for 4 days. On day four ammonia was at 0ppm.You can’t just put ammo lock in and forget about it though. Ammonia builds upon ammonia, so you still have to do water changes to get it all out of the tank. Having the nitrifying bacteria helps to make the conversion of remaining ammonia to nitrate more manageable for the tank.
Grotto –
This solved my amonia problem
I have had my freshwater tank since 2018 and never had an ammonia problem like this before. For about 3 months I’ve tried everything. I guess the ammonia problem was caused because I increased fish, but I have no idea because I have a 100 gallon external filter on my 20 gallon tank. Anyway, the problem was persistent ammonia even after a 25 or 50 % water change it would creep back up in 1 day. I tried adding media specific for ammonia and nothing helped, for weeks, and monthsDesperate to solve this, I bought Ammo Lock because I was leaving town for a week. Immediately my ammonia test results went from green to yellow. I also put in a 1 year ammonia meter and it is indicating yellow as well. Typically, I change the water weekly, and I will include this in my routine from now on. Nothing else was making the ammonia manageable before this. Highly recommend.
Michael Daniel via –
Excellent product
Good product
Sprinting Yogini –
Kept all my fish alive!
Iâm a new fish keeper and made the mistake of thinking my tank was cycled when it wasnât. When I added my first fish (a month after set up) my ammonia levels went above the maximum level on the testing strip. The test water was dark blue almost black!I used this as directed. At one point I had a bad bacteria bloom and couldnât even see my fish, but kept testing and using as directed, along with daily 10-20% water changes. The water cleared up within a week. Cloudiness is the good bacteria putting up a fight. Gross, but not harmful if your water is oxygenated enough.No matter what happened with the water, my fish were active and happy and kept good color. After three weeks, my good bacteria has taken over and no more ammonia. Iâm honestly shocked nobody died with the mistake I made in cycling the tank and I think ammolock is why.I have oto cats, Serpae tetras, phantom tetras and sword tails in a 40 gallon planted tank.
Moon –
This product does not remove ammonia; it only converts toxic ammonia (NH3) into a non-toxic form (NH4âº) that is safe for fish. Therefore, the total ammonia nitrogen (TAN = NH3 + NH4âº) is not reduced. Keep in mind that standard test kits also measure TAN, not just free ammonia (NH3). As a result, test readings will not drop significantly after using this product, even though the harmful part has been neutralized. The actual removal of ammonia happens only when beneficial bacteria in the biological filter are working properly.
RRaj Pakhare –
I have been using many big brands for my 2 aquarium. I have a one gold fish tank with 18 gold fishes but 2 filters, one top filter and one Fluval canister filter with lots of Biomedia of Api, matrix, denitrate, purigen, etc. But sometimes the ammonia level does increase and tank starts stinking. But with this Api Ammo lock in 2 days everything is under control and the smell also goes away.I have become a fan of API brand and will always buy it.I will recommend these brands if you love your fishes:Seachem, API, ADA, Fluval and BubblesTroubles.
Fem –
When my water amonia level was high, I used this, and it worked so well. I always keep this on hand,
Withdrawnmist –
API AMMO-LOCK is an absolute lifesaver! It instantly neutralises harmful ammonia, keeping my fish safe and stress-free. Iâve used it in both freshwater and marine tanks, and it works perfectly every time.The 473 ml bottle lasts a long time, and the dosage instructions are clear and easy to follow. I really notice the difference in water clarity and fish behaviour after using it â especially during filter maintenance or new tank cycles.Itâs one of those products I always keep on hand. Reliable, effective, and excellent quality â highly recommend for any aquarium setup! ð ð§
Kindle Customer –
This is a very effective product which I use for fish transport.